We believe in good quality and safe products. It is proven that you will not be able to find high quality grade, service, warranty, or performance if you are looking at a motor/battery system under $1100, or an electric bike under $1800. Geared hub motor electric bikes range from $2000 to $3000. These meet bicycle parts and electric system standards, and are considered as reliable.
If using a high brand mid-drive motor system such as Bosch, Shimano, etc. you need to make sure not to trade the bicycle quality with the motor brand in lower price bracket.